Question

iron is harder than sodium because

Answer 1

Answer:

Iron is tougher than sodium because metallic bonds are stronger in iron. Stronger is metallic bonding (Fe has dd -subshell), more is hardness.

Answer 2

$\huge\underline\mathrm\pink{Answer}$

Iron is harder than sodium because all metals have metallic bonding .

Sodium is an alkali metal and is very soft and can cut through knife while iron is a transition metal which is very hard and requires great energy to break apart.